The antennae sit in from of[clarification needed] the clypeus and have spindle-like, compressed flagellae, those of the male are branching.

D. fuscipennis has a number of hosts, mainly sawflies of the family Diprionidae but it can also act as a hyperparasitoid on parasites of the eonymph of Ichneumonidae.

[2] In Canada only two full generations and a partial one are completed each summer with the wasps overwintering as fifth instar larvae, prepupae or pupae.

[3] The adult females of D. fuscipennis mate soon after emergence and oviposit their white, oval eggs in groups of 10-50, the mean clutch being 30, through the cocoon and onto the cuticle of the prepupal stage of their host insects.

[4] D. fuscipennis are poor fliers and search for their hosts by flying slowly through forested areas and find their prey cocoons on the surface layer of the soil and within the crowns of young trees with cocoons in the leaf litter having the highest rates of parasitism.

[5] Dahlbominus fuscipennis is native to Europe from France to western Siberia (Novosibirsk), north to Scandinavia and south to the Balkans.

The Canadian Department of Agriculture started to import Dahlbominus fuscipennis from Europe in 1933 to be propagated in an insectary with several hundred million of the progeny being released since then in an attempt to control invasive European species of sawflies.

Between 1935 and 139 the Canadian's exported a large number of the wasps to the United States where they were also released to control invasive sawflies as well as being bred at the Bureau of Entomology and Plant Quarantine, the Maine Forest Service and the New Jersey Department of Agriculture.